-
Notifications
You must be signed in to change notification settings - Fork 143
[Server][Transport] SEP-2322: Multi Round-Trip Requests on Streamable HTTP #342
Copy link
Copy link
Open
Labels
2026-07-28All issues and PRs related to the spec release 2026-07-28All issues and PRs related to the spec release 2026-07-28ClientIssues & PRs related to the Client componentIssues & PRs related to the Client componentP0Broken core functionality, security issues, critical missing featureBroken core functionality, security issues, critical missing featureSchemaIssues & PRs related to the Schema componentIssues & PRs related to the Schema componentServerIssues & PRs related to the Server componentIssues & PRs related to the Server componentbreaking changeBreaking the Backwards Compatibility PromiseBreaking the Backwards Compatibility PromiseenhancementRequest for a new feature that's not currently supportedRequest for a new feature that's not currently supportedimproves spec complianceImproves consistency with other SDKs such as TyepScriptImproves consistency with other SDKs such as TyepScriptneeds designValid issue but needs maintainer alignment on design or approachValid issue but needs maintainer alignment on design or approach
Description
Metadata
Metadata
Assignees
Labels
2026-07-28All issues and PRs related to the spec release 2026-07-28All issues and PRs related to the spec release 2026-07-28ClientIssues & PRs related to the Client componentIssues & PRs related to the Client componentP0Broken core functionality, security issues, critical missing featureBroken core functionality, security issues, critical missing featureSchemaIssues & PRs related to the Schema componentIssues & PRs related to the Schema componentServerIssues & PRs related to the Server componentIssues & PRs related to the Server componentbreaking changeBreaking the Backwards Compatibility PromiseBreaking the Backwards Compatibility PromiseenhancementRequest for a new feature that's not currently supportedRequest for a new feature that's not currently supportedimproves spec complianceImproves consistency with other SDKs such as TyepScriptImproves consistency with other SDKs such as TyepScriptneeds designValid issue but needs maintainer alignment on design or approachValid issue but needs maintainer alignment on design or approach
Type
Fields
Give feedbackNo fields configured for issues without a type.
Projects
StatusShow more project fields
Todo
Implements SEP-2322 for the MCP Spec 2026-07-28 release.
Tracked by umbrella #334.
Spec summary
PHP SDK changes
src/Server/Transport/StreamableHttpTransport.php— POST handler must support multi-turn streams (keep connection open for nested round trips within a single logical request), separate frommessages/listen.src/Server/Protocol.php— Fiber suspension currently relies on session-stored__pending_responses. Refactor to associate pending responses with the request rather than the session.src/JsonRpc/MessageFactory.php— new envelope fields for parent-request correlation.src/Client/Transport/HttpTransport.phpandsrc/Client/Protocol.php— handle inline server requests on the response stream.src/Schema/to describe MRTR envelope.Breaking change. Companion to SEP-2567 (sessionless) — they must land together.
Related
modelcontextprotocol/conformance#188